Optimization of beam quality for all-fiber lasers

DONG Fan-long; ZHAO Fang-zhou; GE Ting-wu; WANG Zhi-yong

doi:10.3788/OPE.20142204.0844

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Optimization of beam quality for all-fiber lasers

Modern Applied Optics | 更新时间：2020-08-13

- Optimization of beam quality for all-fiber lasers
- Optics and Precision Engineering Vol. 22, Issue 4, Pages: 844-849(2014)
- 作者机构：
  
  北京工业大学激光工程研究院国家产学研激光技术中心北京,100124
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142204.0844
  CLC： TN248.1
- Received：26 June 2013，
  
  Revised：25 August 2013，
  
  Published：25 April 2014
- 稿件说明：
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董繁龙, 赵方舟, 葛廷武等. 全光纤激光器光束质量的优化[J]. 光学精密工程, 2014,22(4): 844-849

DONG Fan-long, ZHAO Fang-zhou, GE Ting-wu etc. Optimization of beam quality for all-fiber lasers[J]. Editorial Office of Optics and Precision Engineering, 2014,22(4): 844-849
董繁龙, 赵方舟, 葛廷武等. 全光纤激光器光束质量的优化[J]. 光学精密工程, 2014,22(4): 844-849 DOI： 10.3788/OPE.20142204.0844.

DONG Fan-long, ZHAO Fang-zhou, GE Ting-wu etc. Optimization of beam quality for all-fiber lasers[J]. Editorial Office of Optics and Precision Engineering, 2014,22(4): 844-849 DOI： 10.3788/OPE.20142204.0844.

摘要

基于激光器的结构，实验研究了影响光束质量的因素。搭建了百瓦级全光纤激光器，在最大泵浦功率为436 W的条件下，在1 080 nm处获得的激光输出为300 W，光-光转换效率为69%，光束质量

为1.13。实验研究了谐振腔出射的激光光束在传能光纤中传输时径向功率分布的变化，结果显示：随着光束在光纤中传输距离的增加，光纤中的包层光功率呈现出先增加后保持不变的趋势，因而在传输距离上选择不同的长度对包层光进行剥除，可以获得不同的光束质量。实验还显示，在相同的泵浦条件下，与包层光剥离器设置在腔外相比，其设置在谐振腔内可获得更高的激光输出功率，但是光束质量较差。最后，采用在腔内腔外各加一个包层光剥离器的方法获得了更好的光束质量，此时

为1.07。

Abstract

On the basis of laser structures

factors affecting on the beam quality were experimentally explored to improve the beam quality of fiber lasers. A hundred-watts class all-fiber laser with an output power of 300 W at 1 080 nm was built when the maximum pump power was 436 W. The beam quality(

) was tested

and experiments show that the

is 1.13 and optical-optical conversion efficiency is 69%. Then

the change of the radial power distribution of the laser beam that transported in a fiber was experimentally analyzed. The result shows that the cladding light power increases initially and remains constant afterwards as the transmission distance of laser beam increases in the fiber. Therefore

different beam qualities can be obtained after stripping the cladding light at any selected transmission distance. In addition

the higher laser output power can be obtained when the cladding light stripper is set inside instead of outside of the cavity under the same pumping conditions. However

a worse beam quality is left in this case. Finally

a better beam quality

at 1.07 is obtained by setting two cladding light strippers outside and insider the cavity

respectively.

关键词

Keywords

references

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Key Laboratory of Trans-scale Laser Manufacturing Technology （Beijing University of Technology），Ministry of Education

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